问题
选择题
They want to develop a kind of dog-friendly food _____ will help dog owners cool down their pets. [ ]
A. who
B. what
C. which
D. whether
答案
答案：C
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They want to develop a kind of dog-friendly food _____ will help dog owners cool down their pets. [ ]
A. who
B. what
C. which
D. whether
答案：C